JP5413236B2 - Image display body, personal authentication medium and blank medium - Google Patents

Description

  The present invention relates to an image display technique that can be used for personal authentication, for example.

  Many personal authentication media such as passports and ID (identification) cards use facial images to enable visual personal authentication.

  For example, in a passport, conventionally, photographic paper on which a face image is printed is pasted on a booklet. However, such passports may be tampered with by reprinting photographic prints.

  For these reasons, in recent years, there is a tendency to digitize facial image information and reproduce it on a booklet. As this image reproduction method, for example, a thermal transfer recording method using a transfer ribbon has been studied.

  However, recently, thermal transfer recording type printers using sublimation dyes or colored thermoplastic resins are widely used. Considering this situation, it is not always difficult to remove a face image from a passport and record another face image on the face image.

  Patent Document 1 describes that a face image is recorded by the method described above, and a face image is recorded thereon using fluorescent ink. Patent Document 2 describes that a face image is recorded using an ink containing a colorless or light-colored fluorescent dye and a colored pigment. Further, Patent Document 3 describes that a normal face image and a face image formed using a pearl pigment are arranged side by side.

  When these technologies are applied to a passport, the alteration becomes more difficult. However, a face image recorded using a fluorescent material cannot be observed unless a special light source such as an ultraviolet lamp is used. In addition, although a face image formed using a pearl pigment can be visually recognized with the naked eye, it is difficult to form a high-definition image using this because the pearl pigment has a large particle size.

  Also, if the face image recorded on the personal authentication medium looks simple and has no visual effect, it is easier to tamper with it than when the face image has a complex and characteristic visual effect. It is. Further, when the face image is displayed in a simple manner, it is difficult to easily visually determine the falsified and forged face image.

JP 2000-141863 A JP 2002-226740 A Japanese Patent Laid-Open No. 2003-170685

  An object of the present invention is to provide an individual information recording technique that is difficult to tamper with, exhibits a more complicated and characteristic visual effect, and can easily determine authenticity.

The first invention is
An image display body that is transferred from a support onto a base material of a personal authentication medium and displays an image including personal information,
An underlayer that is releasably supported by the support and has light transparency;
A first image display layer including a hologram and / or a diffraction grating, and transferred onto the underlayer by thermal transfer using a thermal head;
The first image display layer displays a first image including at least a part of the personal information and a micro concealment image;
A second image display layer that faces the underlayer and displays a second image using light absorption ;
The first image display layer includes a plurality of dot-shaped portions, and each center of the plurality of dot-shaped portions is located on a lattice point of a virtual planar lattice, and an interval between the lattice points of the planar lattice is the thermal head. It is equal to the center-to-center distance of the dot-like part, which is the basic unit for thermal transfer with
The micro concealment image is included in the diameter of a dot-like portion that is a basic unit for thermal transfer with the thermal head,
The minute concealment image is an image display body characterized in that it is arranged at intervals equal to or an integer multiple of the interval between the lattice points of the planar lattice .
In addition, the second invention,
The first image can display a plurality of images including personal information,
Displaying the first sub-image as a diffraction image when observed from the first direction under specific illumination conditions;
The first sub-image is not displayed as a diffraction image when viewed from a second direction different from the first direction under the illumination condition, or the first sub-image is observed from the first direction A relief-type first sub-diffraction structure that displays a darker diffraction image by comparison;
Displaying a second sub-image different from the first sub-image as a diffraction image when observed from the second direction under the illumination conditions;
The second sub-image is not displayed as a diffraction image when observed from the first direction under the illumination condition, or the diffraction is darker than when the second sub-image is observed from the second direction. A relief-type second sub-diffraction structure for displaying as an image,
The image display body according to claim 1, wherein one of the first sub-image and the second sub-image includes a minute image.
In addition, the third invention,
The image display body according to any one of claims 1 to 2, wherein a length of one side of the minute concealment image is 1 µm or more and 300 µm or less .
In addition, the fourth invention is
The image display body according to any one of claims 1 to 3, wherein the micro concealment image is a micro character that is invisible to the naked eye and includes characters, symbols, numbers, or a combination thereof. />.
In addition, the fifth invention,
The image display body according to any one of claims 1 to 4, wherein the personal information includes a face image .
In addition, the sixth invention,
The image display body according to any one of claims 1 to 5, wherein the second image includes another part of the personal information .
The first image includes first personal information which is a part of the personal information, the second image includes second personal information which is a part of the personal information, and the first and second personal information are The image display body according to any one of claims 1 to 6, wherein the images are face images of the same person .
Further, the eighth invention is
The image display body according to any one of claims 1 to 7, further comprising an adhesive layer facing the base layer with the first image display layer interposed therebetween .
In addition, the ninth invention,
A personal authentication medium comprising: the image display body according to any one of claims 1 to 8; and the base material onto which the image display body is transferred from the support .
The tenth aspect of the invention is
It is a blank medium used for manufacture of the image display body which displays the image containing the personal information described in any one of Claims 1 thru | or 9,
The blank medium includes a support and a transfer material layer 220 that is releasably supported by the support.
The transfer material layer includes at least a diffractive structure forming layer,
The blank medium according to claim 1, wherein the diffraction structure forming layer has a plurality of micro concealment images arranged in a first direction and a second direction intersecting each other .

According to the present invention, it is possible to provide a personal authentication medium that is difficult to tamper with, displays an image with a distinctive visual effect with excellent image quality, and can easily determine authenticity.
According to the first invention, the substrate is transferred from the support onto the base material of the personal authentication medium, and is supported by the support so as to be peeled off. And / or a first image display layer that includes a diffraction grating and is transferred onto the underlayer by thermal transfer using a thermal head. When the first image display layer is directly formed on the substrate of the personal authentication medium by thermal transfer using a thermal head, it is difficult to achieve high image quality due to the surface roughness of the substrate. On the other hand, in this image display body, the first image display layer is formed not on the base material of the personal authentication medium but on the base layer. Then, the first image display layer including at least part of the personal information is transferred onto the base material of the personal authentication medium together with the base layer. Therefore, the surface roughness of the substrate does not greatly affect the image quality. Therefore, when this image display body is used, a personal authentication medium that displays an image with excellent image quality can be obtained.
Further, the image processing apparatus further includes a second image display layer that faces the underlayer and displays a second image by utilizing light absorption. The second image is more visible than the first image. Therefore, when the first and second image display layers are used in combination, an image with excellent visibility can be displayed on the image display body.
In addition, the first image display layer displays a first image including a minute concealment image, and the process for recording such a minute concealment image requires accuracy and is difficult to manufacture. Therefore, this image display body is difficult to tamper with.
Furthermore, a part of personal information is displayed using a hologram and / or a diffraction grating. It is very difficult to tamper with personal information displayed by the hologram and / or diffraction grating. And this image display body is affixed on the base material of a personal authentication medium by thermal transfer. Thus, the image display body affixed to the base material of the personal authentication medium is easily destroyed when it is peeled off from the base material. Therefore, when this image display body is used, a personal authentication medium that is difficult to falsify is obtained.
According to the second invention, when the first image is observed from the first direction under a specific illumination condition, the first sub-image is displayed as a diffraction image, and the first image is displayed under the illumination condition. A relief type in which the first sub-image is not displayed as a diffraction image when observed from a second direction different from the direction, or is displayed as a darker diffraction image compared to the case where the first sub-image is observed from the first direction. A first sub-diffractive structure is included.
When the second sub-image different from the first sub-image is displayed as a diffraction image when observed from the second direction under the illumination conditions, and when observed from the first direction under the illumination conditions It includes a relief-type second sub-diffraction structure that does not display the second sub-image as a diffraction image or displays the second sub-image as a darker diffraction image as compared with the case where the second sub-image is observed from the second direction.
Accordingly, the first sub image can be observed from the first direction and the second sub image can be observed from the second direction under a specific illumination condition. Here, either the first sub-image or the second sub-image includes a minute image. For this reason, if the sub image which does not contain the micro image of the first image display layer is observed, the face image of the personal information can be observed, and if the sub image containing the micro image is observed, the individual A minute image can be observed together with a face image of information.
As a result, the image display body is difficult to tamper with in addition to displaying an image showing a complicated visual effect with high image quality.
According to the first invention, the first image display layer includes a plurality of dot-shaped portions, and the centers of the plurality of dot-shaped portions are located on the lattice points of the virtual planar lattice. Is an image display body equal to the center-to-center distance of the dot-like portion, which is a basic unit when performing thermal transfer with a thermal head. This configuration is suitable for a process of recording an image by thermal transfer using a thermal head.
According to the first invention, the minute concealment image is included in the diameter of the dot-like portion which is a basic unit for thermal transfer by the thermal head. As a result, the entire small concealed image is included in the dot-like portion which is the basic unit for thermal transfer by the thermal head.
According to the first invention, the arrangement interval of the micro concealment images is equal to the interval of the lattice points of the planar lattice, or is arranged at an integer multiple interval. For this reason, when the arrangement interval of the minute concealment images is equal to the center-to-center distance of the dot-like portions that are the basic units for thermal transfer by the thermal head, the minute concealment images are included in all the dot-like portions, When the arrangement interval is arranged at an interval that is an integral multiple of the center-to-center distance of the dot-like portion, which is the basic unit for thermal transfer, all the dot-like portions do not include the micro concealment image and are included at the arrangement interval. Become.
According to the third aspect of the invention, the length of one side of the micro concealment image is 1 μm or more and 300 μm or less. In general, micro characters having a size of 300 μm or less cannot be recognized with the naked eye, and a user of a printed product or the like can determine authenticity by magnifying observation with a magnifying glass or an optical microscope. In particular, micro characters having a size of 1 μm or more and about 50 μm or less are difficult to manufacture with high accuracy.
According to the fourth aspect of the invention, the minute concealment image is a micro character that is invisible to the naked eye and is composed of characters, symbols, numbers, or a combination thereof. Information common to these micro characters, for example, in the case of a passport, information such as the country name and issuance location is recorded, and in the case of an ID card, information such as the company name and affiliation is recorded. Even if the image display body is forged, the authenticity determination can be performed by confirming the minute concealment image.
According to the fifth invention, the personal information includes a face image. A face image is common as biometric information, and is suitable for visual personal authentication.
In addition, according to the sixth aspect of the present invention, there is provided a personal authentication medium that is difficult to falsify, displays an image of a visual effect having a characteristic with excellent image quality, and can easily determine authenticity.
According to the seventh invention, the first image includes first personal information that is a part of personal information, and the second image includes second personal information that is a part of personal information. 2 Personal information is the face image of the same person. As a result, the image display body is more difficult to counterfeit than an image display body in which only the first image includes personal information.

According to the eighth invention, the image display body further includes an adhesive layer facing the base layer with the first image display layer interposed therebetween. The adhesive layer firmly adheres the image display body to the base material when the image display body is transferred from the support onto the base material of the personal authentication medium. The adhesive layer also makes it difficult to replicate the hologram and / or diffraction grating.
According to the ninth invention, the personal authentication medium includes any one of the image display bodies described above. Therefore, this personal authentication medium is difficult to tamper with, and can display an image with a distinctive visual effect with excellent image quality, and can easily determine authenticity.
Further, according to the tenth invention, by using the blank medium of the present invention, it is difficult to tamper with, and it is possible to display a characteristic visual effect image with excellent image quality and to easily determine the authenticity. Personal authentication media are provided.

The top view which shows roughly the personal authentication medium which concerns on 1 aspect of this invention. The top view which expands and shows a part of image display body contained in the personal authentication medium of FIG. Sectional drawing along the III-III line of the image display body shown in FIG. The top view which expands and shows other part of the image display body contained in the personal authentication medium of FIG. Sectional drawing along the VV line of the image display body shown in FIG. Sectional drawing which shows roughly an example of the blank medium which can be used for manufacture of the image display body shown in FIG. 2 thru | or FIG. The top view which shows roughly an example of the micro concealment image of the blank medium which can be used for manufacture of the image display body shown in FIG. 2 thru | or FIG. Sectional drawing which shows roughly an example of the transfer foil which can be manufactured using the blank medium shown in FIG. Sectional drawing which shows an example of a used blank medium roughly. FIG. 6 is a plan view schematically showing a diffractive structure included in the image display shown in FIGS. 2 to 5. FIG. 6 is a plan view schematically showing another diffractive structure included in the image display shown in FIGS. 2 to 5. The top view which shows roughly an example of the diffraction grating arrangement | sequence of the image display body contained in the personal authentication medium of FIG. The top view which shows roughly another example of the diffraction grating arrangement | sequence of the image display body contained in the personal authentication medium of FIG. The top view which shows roughly an example of the image display using the diffraction grating arrangement | sequence of the image display body shown in FIG. The top view which shows roughly an example of the display image of the image display body shown in FIG. The top view which shows roughly an example of the other display image of the image display body shown in FIG. FIG. 14 is a plan view schematically illustrating an example of a display image of the image display body illustrated in FIGS. 10 to 13.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, the same referential mark is attached | subjected to the component which exhibits the same or similar function through all the drawings, and the overlapping description is abbreviate | omitted.

FIG. 1 is a plan view schematically showing a personal authentication medium according to one aspect of the present invention.
A personal authentication medium 100 shown in FIG. 1 is a booklet such as a passport. FIG. 1 shows the booklet in an open state.

This personal authentication medium 100 includes a signature 1 and a cover 2.
The signature 1 is composed of one or more pieces of paper 11. Typically, a print pattern 12 such as a character string and a background pattern is provided on the paper piece 11. The signature 1 is formed by folding one paper piece 11 or a bundle of a plurality of paper pieces 11 into two. The paper piece 11 may incorporate an IC (integrated circuit) chip in which personal information is recorded, an antenna that enables non-contact communication with the IC chip, and the like.

  The cover 2 is folded in half. The cover 2 and the signature 1 are overlapped so that the signature 1 is sandwiched by the cover 2 with the booklet closed, and are integrated by binding or the like at the positions of the folds.

  The cover 2 displays an image including personal information. This personal information includes personal authentication information used for personal authentication. This personal information can be classified into, for example, biological information and non-biological personal information.

  The biological information is unique to the individual among the characteristics of the biological body. Typically, biometric information is a feature that can be identified by optical techniques. For example, the biometric information is at least one image or pattern of a face, fingerprint, vein, and iris.

  Non-biological personal information is personal information other than biological information. For example, the non-biological personal information is at least one of name, date of birth, age, blood type, gender, nationality, address, permanent address, telephone number, affiliation, and status. The non-biological personal information may include characters input by typing, may include characters input by machine reading a handwriting such as a signature, or may include both of them. .

In FIG. 1, the cover 2 displays images I1a, I1b, I2 and I3.
The images I1a, I2 and I3 are images displayed using light absorption. Specifically, the images I1a, I2, and I3 are images that are visible when illuminated with white light and observed with the naked eye. One or more of the images I1a, I2 and I3 may be omitted.

  The images I1a, I2 and I3 can be composed of, for example, dyes and pigments. In this case, the images I1a, I2 and I3 can be formed by a thermal transfer recording method using a thermal head, an ink jet recording method, an electrophotographic method, or a combination of two or more thereof. Alternatively, the images I1a, I2 and I3 can be formed by forming a layer containing a thermal color former and drawing on this layer with a laser beam. Alternatively, a combination of these methods can be used. At least a part of the images I2 and I3 may be formed by a thermal transfer recording method using a hot stamp, may be formed by a printing method, or may be formed using a combination thereof.

  The image I1b is an image displayed by the hologram and / or the diffraction grating. As will be described in detail later, the image I1b is formed, for example, by performing thermal transfer recording using a thermal head and thermal transfer recording using a hot stamp or a heat roll in this order.

  The images I1a and I1b include face images of the same person. The face image included in the image I1a and the face image included in the image I1b may be the same or different. The face image included in the image I1a and the face image included in the image I1b may have the same or different dimensions. Each of the images I1a and I1b may include other biological information instead of the face image, and may further include biological information other than the face image in addition to the face image.

  The image I1b may include non-biological personal information instead of the biological information, and may further include non-biological personal information in addition to the biological information. The image I1b may include non-personal information instead of personal information, and may further include non-personal information in addition to the personal information.

  The image I2 includes non-biological personal information and non-personal information. The image I2 forms, for example, one or more of characters, symbols, codes, and marks.

  The image I3 is a background pattern. For example, the combination of the image I3 and at least one of the images I1a and I1b can make the personal authentication medium 100 more difficult to falsify.

Next, the structure of the cover 2 will be described with reference to FIGS.
FIG. 2 is an enlarged plan view showing a part of the image display body included in the personal authentication medium of FIG. 3 is a cross-sectional view of the image display body shown in FIG. 2 taken along the line III-III. FIG. 4 is an enlarged plan view showing another part of the image display body included in the personal authentication medium of FIG. FIG. 5 is a cross-sectional view taken along line VV of the image display body shown in FIG.

  The structure shown in FIGS. 2 and 3 is a portion of the cover 2 corresponding to the image I1a. On the other hand, the structure shown in FIGS. 4 and 5 is a portion corresponding to the image I1b in the cover 2. The X direction is a direction parallel to the display surface of the image display body, the Y direction is a direction parallel to the display surface of the image display body and a direction perpendicular to the X direction, and the Z direction is X and X. This is a direction perpendicular to the Y direction.

  As shown in FIGS. 3 and 5, the cover 2 includes a cover main body 21 and an image display body 22.

  The cover main body 21 is a base material of the personal authentication medium 100 and is typically a piece of paper. The cover main body 21 may have a single layer structure or a multilayer structure. The cover body 21 is folded in half so as to sandwich the signature 1 in a state where the personal authentication medium 100 is closed.

  The image display body 22 is a layer having a multilayer structure. The image display body 22 is affixed to the main surface of the cover body 21 that faces the signature 1 when the personal authentication medium 100 is closed.

The image display body 22 includes image display layers 210 and 220 a and a peeling protection layer 227.
The image display layer 210 displays the image I1a using light absorption. As shown in FIGS. 2 and 3, the image display layer 210 has a pattern shape corresponding to the image I1a. The image display layer 210 can be composed of at least one of a dye and a pigment and an arbitrary resin. Such an image display layer 210 can be obtained by using, for example, a thermal transfer recording method using a thermal head, an inkjet recording method, an electrophotographic method, or a combination of two or more thereof.

  The image display layer 210 may not be patterned. That is, the image display layer 210 may be a continuous film. In this case, the image display layer 210 can be obtained, for example, by forming a layer containing a thermal color former and drawing on this layer with a laser beam.

  The image display layer 220a includes a hologram and / or a diffraction grating. As shown in FIGS. 4 and 5, the image display layer 220a has a pattern shape corresponding to the image I1b. The structure and formation method of the image display layer 220a will be described in detail later.

  The peeling protection layer 227 covers the image display layers 210 and 220 a and the cover body 21. The peeling protective layer 227 has light transmissivity and is typically transparent. The peeling protection layer 227 is made of, for example, a resin.

  Note that the portion corresponding to the image I2 in the cover 2 can employ a structure substantially similar to that described above with respect to the portion corresponding to the image I1a, except that the displayed image is different. The portion corresponding to the image I1a and the portion corresponding to the image I2 in the cover 2 may have the same laminated structure or may have different laminated structures.

  Next, the manufacturing method of the personal authentication medium 100 and the structure of the image display layer 220a will be described with reference to FIGS.

  FIG. 6 is a cross-sectional view schematically showing an example of a blank medium that can be used for manufacturing the image display shown in FIGS. FIG. 7 is a plan view schematically showing an example of a micro concealment image of a blank medium that can be used for manufacturing the image display body shown in FIGS. FIG. 8 is a cross-sectional view schematically showing an example of a transfer foil that can be manufactured using the blank medium shown in FIG. FIG. 9 is a cross-sectional view schematically showing an example of a used blank medium.

  A blank medium 201 shown in FIG. 6 is, for example, a transfer ribbon. The blank medium 201 includes a support 221 and a transfer material layer 220 that is releasably supported by the support 221.

  The support body 221 is, for example, a resin film or a sheet. The support 221 is made of a material having excellent heat resistance such as polyethylene terephthalate. On the main surface supporting the transfer material layer 220 of the support 221, for example, a release layer containing a fluororesin or a silicone resin may be provided.

  The transfer material layer 220 includes a release layer 222, a diffraction structure forming layer 223, a reflective layer 224, and an adhesive layer 225.

  The release layer 222 is formed on the support 221. The release layer 222 serves to stabilize the release of the transfer agent layer 220 from the support 221 and to promote adhesion of the image display layer 220a to the cover body 21. The release layer 222 has light transmissivity and is typically transparent. The release layer 222 is made of, for example, a thermoplastic resin. The peeling layer 222 can be omitted.

  The diffraction structure forming layer 223 is formed on the release layer 222. The diffraction structure forming layer 223 includes at least one of a hologram and a diffraction grating as a diffraction structure. Here, the diffractive structure forming layer 223 is a transparent layer having a relief structure as a diffractive structure on the surface. As a material for the transparent layer, a resin such as a photocurable resin, a thermosetting resin, and a thermoplastic resin can be used. The diffraction structure forming layer 223 may be a volume hologram.

  The reflective layer 224 is formed on the diffractive structure forming layer 223. Although the reflective layer 224 can be omitted, when the reflective layer 224 is provided, the visibility of an image displayed by the diffraction structure is improved.

  As the reflective layer 224, for example, a transparent reflective layer or an opaque metal reflective layer can be used. The reflective layer 224 can be formed by, for example, a vacuum film forming method such as vacuum deposition or sputtering.

  As the transparent reflective layer, for example, a layer made of a transparent material having a refractive index different from that of the diffraction structure forming layer 223 can be used. The transparent reflective layer made of a transparent material may have a single layer structure or a multilayer structure. In the latter case, the transparent reflective layer may be designed so as to repeatedly cause reflection interference. As this transparent material, for example, a transparent dielectric such as zinc sulfide and titanium dioxide can be used.

  Alternatively, a metal layer having a thickness of less than 20 nm may be used as the transparent reflective layer. As a material of the metal layer, for example, a single metal such as chromium, nickel, aluminum, iron, titanium, silver, gold, and copper, or an alloy thereof can be used.

  As the opaque metal reflection layer, the same metal layer as described above for the transparent reflection layer can be used except that it is thicker.

  The adhesive layer 225 is formed on the reflective layer 224. The adhesive layer 225 is made of, for example, a thermoplastic resin. The adhesive layer 225 can be omitted.

A minute concealment image 300 is recorded on the diffraction structure forming layer 223. FIG. 7 shows an example of a small concealment image.
The micro concealment image uses micro characters that are invisible to the naked eye and are composed of characters, symbols, numbers, or combinations thereof. Here, the character concealment image 300 represents the character string “TOP”, and the character height 301 needs to be smaller than the diameter of the dot-like portion when the thermal transfer is performed by the thermal head. The pitch 302 to be arranged needs to be equal to the diameter of the dot-shaped portion or the minimum center distance of the dot-shaped portion. However, the pitch 302 does not have to be equal to the minimum center-to-center distance if the minute concealment image does not necessarily enter the dot-like portion.

  In general, micro characters having a size of 300 μm or less cannot be recognized with the naked eye. Particularly, micro characters having a size of 1 μm or more and about 50 μm or less are difficult to manufacture with high accuracy. However, a higher anti-counterfeit effect can be expected.

The micro concealment image does not need to have a diffractive structure, and can be confirmed by a magnified observation with a magnifying glass or an optical microscope, such as a diffractive structure, not a diffractive structure, but a different depth, such as a different depth. I just need it. Moreover, a diffractive structure may be sufficient. In this case, a method of changing the angle of the diffraction grating to a different angle only in the pattern portion of the minute concealment image is used.
In this case, as an example of a micro image, a micro character that is invisible to the naked eye made up of letters, symbols, numbers, or a combination thereof is cited, but it is not necessary to limit to this, for example, a mark, a trademark, a design, etc. It may be adopted.

  The small concealment images 300 are arranged in first and second directions that intersect each other. Each center of the small concealment image 300 is located on a lattice point of a virtual planar lattice, and the interval between the lattice points of the planar lattice is equal to the center-to-center distance of the dot-like portion that is a basic unit for thermal transfer by the thermal head. It is preferable because a concealed image can be given to each dot-like portion.

  In manufacturing the personal authentication medium 100, for example, first, a person's face is photographed using an imaging device. Alternatively, a face image is read from the print. Thereby, image information is obtained as electronic information. This face image is subjected to image processing as necessary.

  Next, a laminate 203 shown in FIG. 8 is prepared. The stacked body 203 is a layer having a multilayer structure, and includes a support 226 and a peeling protective layer 227 and a resin layer 228 sequentially formed thereon. The multilayer structure formed on the support 226 forms an underlayer. The support body 226 supports the base layer in a peelable manner.

  As the support body 226, for example, those exemplified for the support body 221 can be used.

  The peeling protection layer 227 serves to stabilize the peeling of the transfer agent layer 220 including the peeling protection layer 227 and the image display layer 220a from the support 226 and to protect the image display layer 220a from damage. As the peeling protective layer 227, for example, those exemplified for the peeling layer 222 can be used. In the case where the resin layer 228 has a function of a release layer, the release protective layer 227 can be omitted.

  The resin layer 228 has optical transparency and is typically transparent. The resin layer 228 plays a role of giving sufficient strength to the previous base layer. As a material of the resin layer 228, for example, a thermosetting resin, a photocurable resin, and a thermoplastic resin can be used. When a thermosetting resin is used, the resin layer 228 can be used as an adhesive layer for bonding the image display body 22 to the cover body 21.

  The resin layer 228 may include at least one of a hologram and a diffraction grating as a diffraction structure. For example, a relief structure as a diffractive structure may be provided on the surface of the resin layer 228. Thus, the image displayed by the diffraction structure and the image I1b displayed by the image display layer 220a can be overlapped or arranged.

  The laminated body 203 may further include a patterned metal reflection layer, for example, an opaque metal reflection layer. For example, a patterned metal reflective layer is provided on the resin layer 228 or between the release protective layer 227 and the resin layer 228, and halftone dots, lines, other figures, or combinations thereof are provided on the metal reflective layer. It may be displayed. Such a pattern can be used for authenticity determination of the image display body 22 or the personal authentication medium 100, for example.

  Next, an image display layer 220 a having a pattern corresponding to the previous face image is formed on the laminate 203. Specifically, based on the previous image information, a part of the transfer material layer 220 is thermally transferred from the support 221 shown in FIG. 6 to the resin layer 228 shown in FIG. 7 as the image display layer 220a. This thermal transfer is performed using a thermal head so that the portion of the transfer material layer 220 that is thermally transferred onto the resin layer 228 has a pattern corresponding to the previous face image. Thereby, the transfer foil 202 including the support 226, the peeling protection layer 227, the resin layer 228, and the image display layer 220a is obtained. The transfer foil 202 is, for example, a transfer ribbon.

  Since the image display layer 220a thus obtained is formed by thermal transfer using a thermal head, typically, the image display layer 220a is composed of a plurality of dot-like portions as shown in FIGS. Each center of these dot-like portions is located on a lattice point of a virtual plane lattice indicated by a broken line in FIG.

  In FIG. 4, the previous planar lattice is a square lattice, but the planar lattice may be other lattices such as a triangular lattice and a rectangular lattice. Moreover, in FIG. 4, the adjacent dot-like portions are arranged so that their outlines touch at one point. That is, the diameter of each dot-like part is equal to the minimum center-to-center distance of the dot-like part. Adjacent dot-like portions may be separated from each other. That is, the diameter of each dot-shaped portion may be smaller than the minimum center-to-center distance of the dot-shaped portion. Alternatively, the adjacent dot-like portions may be arranged so as to partially overlap. That is, the diameter of each dot-shaped portion may be larger than the minimum center-to-center distance of the dot-shaped portion.

  The diameter of the dot-shaped portion or the minimum center-to-center distance of the dot-shaped portion is, for example, in the range of 0.085 to 0.508 mm (about 300 to about 50 dots per inch). When a face image is displayed on the image display layer 220a, the diameter of the dot-shaped portion or the minimum center-to-center distance of the dot-shaped portion is, for example, in the range of 0.085 to 0.169 mm (about 300 to about 150 dots per inch). Within. When this dimension is increased, it becomes difficult to display a high-definition image on the image display layer 220a. When this dimension is reduced, the reproducibility of the pattern shape of the image display layer 220a is lowered.

  In the used blank medium 201, as shown in FIG. 9, a part 220b of the transfer material layer 220 remains as a negative pattern of the image display layer 220a. This negative pattern can be used for collation of the image display layer 220a.

  Further, in addition to forming the image display layer 220a on the peeling protective layer 227 using a part of the blank medium 201, other parts of the blank medium 201 are used to form a non-coated material on a separately prepared substrate. A pattern for displaying history information such as biometric personal information and the date and time when the image display layer 220a is formed may be thermally transferred. In this way, the used blank medium 201 can be used not only for collating the image display layer 220a but also for collating other information.

  Before forming the image display layer 220a, another layer may be formed on the resin layer 228 or between the peeling protective layer 227 and the resin layer 228. For example, a reflective layer may be formed on the resin layer 228 or between the release protective layer 227 and the resin layer 228, and a hologram and / or a diffraction grating may be formed, or both of them. May be formed.

  The reflective layer may be a continuous film or may be patterned. In the latter case, the pattern of the reflective layer may be a halftone dot, a line, a figure, or a combination thereof. Moreover, this reflective layer may have light transmittance and may be opaque. Note that the hologram and / or diffraction grating typically has optical characteristics different from those of the hologram and / or diffraction grating included in the diffraction structure forming layer 223.

  An image display layer 210 shown in FIGS. 2 and 3 is further formed on the resin layer 228 or between the release protection layer 227 and the resin layer 228. When the image display layer 210 is formed on the resin layer 228, the image display layer 210 may be formed before the image display layer 220a is formed on the resin layer 228, and the image display layer 220a is formed on the resin layer 228. You may form after forming.

  When the image display layer 210 is formed by a thermal transfer method, a sublimation transfer method may be employed, a melt transfer method may be employed, or both of them may be employed. The image displayed by the image display layer 210 may be a monochrome image or a color image. In the latter case, the image display layer 210 uses, for example, one or more ink ribbons to form, for example, four colored layers of yellow, magenta, cyan, and black, or red, green, and blue. It is obtained by forming a colored layer of three colors.

  A layer (not shown) for displaying the image I3 shown in FIG. 1 may be further formed on the resin layer 228 or between the peeling protection layer 227 and the resin layer 228. When the layer for displaying the image I3 is formed on the resin layer 228, this layer may be formed before the image display layer 220a is formed on the resin layer 228, and the image display layer 220a is formed on the resin layer 228. You may carry out after forming. Alternatively, the layer for displaying the image I3 may be formed on the cover body 21 instead of being formed on the resin layer 228 or between the peeling protection layer 227 and the resin layer 228. The layer for displaying the image I3 can be formed by the same method as described for the image display layer 210, for example.

  Next, a portion of the transfer material layer formed on the support 226 to be used as the image display 22 is thermally transferred from the support 226 onto the cover body 21 shown in FIGS. 3 and 5. For this thermal transfer, for example, a hot stamp is used. Instead of thermal transfer using a hot stamp, thermal transfer using a thermal roll or a thermal head may be performed. The image display body 22 is pasted on the cover body 21 as described above.

  A layer for displaying the image I3 may be formed on the cover body 21 as described above. Further, an adhesive anchor layer may be formed on the cover body 21 in order to increase the adhesive strength.

  In the case where it is difficult to bond the image display body 22 to the cover body 21 with high adhesive strength, and when the image display layer 210 is formed after the image display layer 220a is formed, an ink ribbon to which the function of the adhesive ribbon is added is used. May be used. This eliminates the need to use an adhesive ribbon separately from the ink ribbon.

  After the image display body 22 is thermally transferred onto the cover body 21 as described above, necessary steps are appropriately performed. In this way, the personal authentication medium 100 described with reference to FIGS. 1 to 5 is obtained.

  In this method, the image display layer 220a is formed by thermal transfer using a thermal head. The fineness that can be achieved when using a thermal head is higher than the fineness that can be achieved when printing pearl pigments.

  When the image display layer 220a is directly formed on the cover body 21 by thermal transfer using a thermal head, it is difficult to achieve high image quality due to the surface roughness of the cover body 21 and the like. On the other hand, in the method described above, the image display layer 220a is not directly formed on the cover body 21. That is, in this method, first, the film is formed on the peeling protective layer 227, and then transferred onto the cover body 21 together with the peeling protective layer 227. Therefore, the surface roughness of the cover body 21 does not have a great influence on the image quality.

  Therefore, according to this method, an image with excellent image quality can be displayed on the image display layer 220a.

  The image display 22 displays a part of personal information using a hologram and / or a diffraction grating. It is extremely difficult to tamper with personal information displayed by the hologram and / or diffraction grating, particularly biological information.

  In this method, the image display body 22 is supported on the cover body 21 by thermal transfer. Such an image display body 22 is easily destroyed when it is peeled off from the cover body 21. Therefore, the personal authentication medium 100 is difficult to falsify.

  Next, an aspect of the image display body according to the second aspect of the present invention will be described with reference to FIGS. 10 and 11 are plan views schematically showing the diffractive structure included in the image display body shown in FIGS. 12 and 13 are plan views schematically showing an example of the diffraction grating array of the image display body included in the personal authentication medium of FIG. 10 to 13, the X direction is a direction parallel to the display surface of the image display body, and the Y direction is a direction parallel to the display surface of the image display body and a direction perpendicular to the X direction. The Z direction is a direction perpendicular to the X and Y directions.

  In the image display body according to the second aspect of the present invention, when the first image is observed from the first direction under a specific illumination condition, the first sub-image is displayed as a diffraction image. The first sub-image is not displayed as a diffraction image when viewed from a second direction different from the first direction, or the first sub-image is displayed as a darker diffraction image than when observed from the first direction. A relief-type first sub-diffraction structure is included. Here, the first sub-diffractive structure is a diffractive structure 320a as shown in FIG.

  The diffractive structure 320a includes a plurality of grooves Ga. The grooves Ga have the same shape and are arranged in parallel with each other at a constant pitch. The length direction of the groove Ga is inclined counterclockwise with respect to the X direction. In the example shown in FIG. 10, the groove Ga is curved in an arc shape, but the groove Ga may not be curved.

  The diffractive structure 320a displays the first sub-image as a diffracted image when observed from the first direction under a specific illumination condition. The diffractive structure 320a does not display the first sub image as a diffracted image when viewed from a second direction different from the first direction under the previous illumination conditions, or displays the first sub image as the first sub image. It is displayed as a darker diffraction image than when observed from one direction. Here, the first sub-image displayed by the diffraction structure 320a as a diffraction image is an image in which diffracted light is emitted in the right direction from the front.

  Next, the image display body according to the second aspect of the present invention displays a second sub-image different from the first sub-image as a diffraction image when observed from the second direction under the illumination condition, A relief that does not display the second sub-image as a diffraction image when viewed from the first direction under illumination conditions, or displays it as a darker diffraction image than when the second sub-image is observed from the second direction. A second sub-diffractive structure of the mold is included. Here, the second sub-diffractive structure is a diffractive structure 320b as shown in FIG.

  The diffractive structure 320b includes a plurality of grooves Gb. The grooves Gb have the same shape and are arranged in parallel with each other at a constant pitch. The length direction of the groove Gb is inclined clockwise with respect to the X direction. In the example shown in FIG. 11, the groove Gb is curved in an arc shape, but the groove Gb may not be curved like the groove Ga.

  The diffractive structure 320b displays a second sub-image different from the first sub-image as a diffracted image when observed from the second direction under the illumination condition, and observes from the first direction under the illumination condition. In this case, the second sub-image is not displayed as a diffraction image, or the second sub-image is displayed as a darker diffraction image as compared with the case where the second sub-image is observed from the second direction. Here, the second sub-image displayed by the diffractive structure 320a as a diffracted image is an image in which diffracted light is emitted in the left direction from the front.

  This allows the first sub-image to be observed from the first direction, i.e. from the right direction, and the second sub-image from the second direction, i.e. from the left direction, under specific lighting conditions. it can.

  Further, when a curved diffraction structure as shown in FIG. 10 or FIG. 11 is combined, a visual effect different from the case where a linear diffraction structure is combined can be obtained. When a curved diffractive structure is used, the viewing area from which the diffracted light exits is wide. For example, when there is a place where the viewing areas of the diffracted light emitted from the first subpixel and the second subpixel overlap, there is a range in which the first subpixel is viewed with the right eye and the second subpixel is viewed with the left eye Then, both images can be viewed at the same time.

Further, for example, if the arrangement is as follows, each image can be visually recognized without unevenness.
FIG. 12 shows an example of the diffraction grating array of the image display body according to the second aspect of the present invention. The image display body 310 includes a diffractive structure 320a having a first sub-diffractive structure and a diffractive structure 320b having a second sub-diffractive structure. Here, each sub-diffractive structure is linearly arranged in the X direction.

  FIG. 13 shows another example of the diffraction grating array of the image display body according to the second aspect of the present invention. The image display body 311 includes a diffractive structure 320a having a first sub-diffractive structure and a diffractive structure 320b having a second sub-diffractive structure. Here, the sub-diffractive structures are arranged in a checkered pattern.

  Next, with reference to FIGS. 14 to 17, a specific example of image display will be described with respect to an aspect of the image display body according to the second aspect of the present invention. FIG. 14 is a plan view schematically showing an example of image display using the diffraction grating array of the image display body shown in FIG. 15 and 16 are plan views schematically showing an example of a display image of the image display body shown in FIG. FIG. 17 is a plan view schematically showing an example of a display image of the image display body shown in FIGS.

  The image display body 330 in FIG. 14 has the same arrangement as the diffraction grating array of the image display body 311 shown in FIG. ing.

  FIG. 15 focuses on the diffractive structure 340a of the first sub-diffractive structure in the image display body 330 shown in FIG. 14, and since the number of pixels constituting the image is small, it is difficult to distinguish, but as an image of the image , “O”. That is, when the image display body 330 is observed from the right direction, such an image can be observed.

  FIG. 16 focuses on the diffraction structure 340b of the second sub-diffraction structure in the image display body 330 shown in FIG. 14, and X is shown as an image of the image. For this reason, this image can be observed when the image display body 330 is observed from the left direction.

  For example, a face image of personal information may be recorded in the first sub image of the above-described image display body, while a minute image may be recorded in the second sub image. The length of one side of the minute image is 300 μm or more, and is a minute character that can be visually recognized by the naked eye consisting of characters, symbols, numbers, or a combination thereof.

  FIG. 17 is a diagram showing an example of observing a display image of an image display body by such a combination of sub-images. The observation image 350a is an image display body observed from the right direction, the observation image 350b is an image display body observed from the center, and the observation image 350c shows a state where the image display image is observed from the left direction.

  When the image display image is observed from the left direction, a face image 351 of personal information can be observed as shown in the observation image 350c. When the image display image is observed from the center, the face image 351 enters the left eye and the right eye Since the fine character 352 is incident, the face image 351 and the fine character 352 are observed as overlapped as shown in the observation image 350b. Further, when the image display image is observed from the right direction, the fine characters 352 can be observed as shown in the observation image 350a.

  In particular, when viewed from the center, the face image 351 and the fine characters 352 appear to overlap, but since different images are incident on the left and right eyes, they are different from the images normally observed. Recognized with a sense. As a result, the image display body is difficult to tamper with in addition to displaying an image showing a complicated visual effect with high image quality.

  In general, characters having a size of 300 μm or more can be recognized with the naked eye, and information common to these characters, for example, information such as the country name and place of issue in the case of a passport, is recorded. In this case, it is possible to easily determine the authenticity visually by recording information such as the company name and affiliation.

  The personal authentication medium 100 as a passport has been exemplified above, but the technology described above for the personal authentication medium 100 can also be applied to other personal authentication media. For example, this technology can be applied to various cards such as a visa and an ID card.

  The material of the base material to which the image display body 22 is attached may be other than paper. For example, the base material to which the image display body 22 is attached may be a plastic substrate, a metal substrate, a ceramic substrate, or a glass substrate.

  The image to be displayed on the image display layer 220a may include other biological information in addition to the face image, or may include other biological information instead of the face image. The image displayed on the image display layer 220a may include at least one of non-biological personal information and non-personal information in addition to biometric information, and at least non-biological personal information and non-personal information instead of the biometric information. One may be included.

  DESCRIPTION OF SYMBOLS 1 ... Signature, 2 ... Cover, 11 ... Paper piece, 21 ... Cover body, 22 ... Image display body, 22 '... Transfer material layer, 100 ... Personal authentication medium, 201 ... Transfer foil, 202 ... Transfer foil, 210 ... Image Display layer, 220a ... Image display layer, 220b ... Image display layer, 223 ... Diffraction structure forming layer, 223b ... Diffraction structure forming layer, 223c ... Underlayer, 224 ... Reflective layer, 225 ... Adhesive layer, 226 ... Support, 227 DESCRIPTION OF SYMBOLS ... Peeling protective layer, 228 ... Resin layer, 300 ... Micro concealment image, 301 ... Height, 302 ... Pitch, 310 ... Image display body, 311 ... Image display body, 320a ... Diffraction structure, 320b ... Diffraction structure, 330 ... Image Display, 340a ... Diffraction structure, 340b ... Diffraction structure, 350a ... Observation image, 350b ... Observation image, 350c ... Observation image, 351 ... Face image, 352 ... Fine characters, Ga ... Groove, Gb ... Groove, I1 ... image, I1b ... image, I2 ... image, I3 ... image

Claims (10)

An image display body that is transferred from a support onto a base material of a personal authentication medium and displays an image including personal information,
An underlayer that is releasably supported by the support and has light transparency;
A first image display layer including a hologram and / or a diffraction grating, and transferred onto the underlayer by thermal transfer using a thermal head;
The first image display layer displays a first image including at least a part of the personal information and a micro concealment image;
A second image display layer that faces the underlayer and displays a second image using light absorption ;
The first image display layer includes a plurality of dot-shaped portions, and each center of the plurality of dot-shaped portions is located on a lattice point of a virtual planar lattice, and an interval between the lattice points of the planar lattice is the thermal head. It is equal to the center-to-center distance of the dot-like part, which is the basic unit for thermal transfer with
The micro concealment image is included in the diameter of a dot-like portion that is a basic unit for thermal transfer with the thermal head,
The image display body , wherein the minute concealment images are arranged at intervals equal to or an integer multiple of a lattice point interval of the planar lattice . The first image can display a plurality of images including personal information,
Displaying the first sub-image as a diffraction image when observed from the first direction under specific illumination conditions;
The first sub-image is not displayed as a diffraction image when viewed from a second direction different from the first direction under the illumination condition, or the first sub-image is observed from the first direction A relief-type first sub-diffraction structure that displays a darker diffraction image by comparison;
Displaying a second sub-image different from the first sub-image as a diffraction image when observed from the second direction under the illumination conditions;
The second sub-image is not displayed as a diffraction image when observed from the first direction under the illumination condition, or the diffraction is darker than when the second sub-image is observed from the second direction. A relief-type second sub-diffraction structure for displaying as an image,
The image display body according to claim 1, wherein either the first sub-image or the second sub-image includes a minute image. Length of one side of the micro-concealed image, the image display body according to any one of claims 1 to 2, characterized in that at 1μm or more 300μm or less. The image display body according to any one of claims 1 to 3 , wherein the minute concealment image is a micro character that is invisible to the naked eye and includes characters, symbols, numbers, or a combination thereof. The personal information image display according to any one of claims 1 to 4, characterized in that it contains a face image. The image display body according to any one of the second image according to claim 1 to 5, including another portion of the personal information. The first image includes first personal information which is a part of the personal information, the second image includes second personal information which is a part of the personal information, and the first and second personal information are the image display body according to any one of claims 1 to 6, characterized in that the same person's face image. Wherein in between the first image display layer, the image display body according to any one of claims 1 to 7 an adhesive layer facing the base layer further comprises. A personal authentication medium comprising: the image display body according to any one of claims 1 to 8 ; and the base material onto which the image display body is transferred from the support. It is a blank medium used for manufacture of the image display body which displays the image containing the personal information described in any one of Claims 1 thru | or 9 ,
The blank medium includes a support and a transfer material layer 220 that is releasably supported by the support.
The transfer material layer includes at least a diffractive structure forming layer,
The blank medium, wherein the diffractive structure forming layer has a small concealed image arranged in a plurality of first and second directions intersecting each other.